Friction let-off mechanism for looms.



S. S. JACKSON. FRICTION LET-OFF MECHANISM FOR LOOMS.

APPLICATION FILED AUG.27| 1914.

Patented Aug. 7, 1917.

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5y @M Qwwbw Inventor.-

a with a stationary hook 5 in connection ATES PATENT @FFTQE SIMEON S. JACKSON, OF BOSTON, MASSACHUSETTS, ASSIG-NOR TO THE STAFFORD COM- PANY, 0F READVILLE, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

FRICTION LET-OFF MECHANISM FOR LOOlVIS.

Specification of Letters Patent.

Patented Aug. 7, 1917.

Application filed August 27, 1914. Serial No. 858,878.

To all whom it may concern:

Be it known that I, SIMnoN S. JACKSON, a subject of Great Britain, residing at Boston, in the county of Suffolk, State of "Massa-chusetts, have invented a certain new and useful Improvement in Friction Let-Off Mechanism for Looms, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention is an improvement in friction let-off mechanisms of that class in which the weight of the warp-beam and its load of warp operates the friction devices that restrain the turning movement of the beam and thereby control the unwinding of the warp.

The invention consists, more particularly, in an improved construction and combination of parts through which the weight of the warp-beam and its load of warp operaatesthe friction-band, rope, or chain.

The invention is illustrated in the accompanying drawings, in which Figure l is an end elevation of a warp-beam with the invention applied in connection therewith. Figs. 2 and 3 are details.

The drawing shows the head or flange 1 of one end of the warp-beam, the journal or gudgeon 2 of such end, the friction-ring or ruffle 3 of such end, and a friction-chain 4 which encircles said ring or ruffle. Said friction-chain has one end thereof engageld wit the loom-frame (not shown) and the other end thereof connected with the devices through which the weight of the warp-beam and its contents is transmitted to tighten the friction-chain around the ring or ruffle 3. Hook 5 is shown engaged with a fixed stand or bracket 6, which latter in practice is fixed in position upon the loo1n-frame. The stem of said hook passes through a hole in the stand or bracket, and is screw-threaded. The screw-threaded portion receives thereon above the stand or bracket the nuts 7, 7, by means of which the hook may be adjusted lengthwise of its stem to in turn adjust the friction-chain.

The devices through which the weight of the warp-beam and its contents is transmitted to the friction-band, rope, or chain to tighten the latter around the friction-ring or ruffle 3 of the warp-beam comprise a lever 8 having an open bearing which receives the journal or gudgeon 2 of the warp-beam, a connectlng-link 9, and a lever 10 having a hook 11 with which the lower end of the friction-band, rope, or chain is engaged. Levers S and 10 are arranged parallel with the beam-head or flange 1, and therefore parallel with the adjacent loon1side, not shown. The said levers are pivotally mounted upon pivots at 8 and 10, respectively, in connection with the loom-frame. The pivot 8 is located at the front of the journal or gudgeon 2. Pivot 10 is located rearwardly thereof. Lever 8 supports the weight of the warp-beam and its contents, such weightbeing transmitted by means of the connecting link 9 to the lever 10, and through the lever 10 acts to tighten the friction-band, rope, or chain upon the ring or ruffle 3.

To enable the effect of the weight of the warp-beam and its contents in tightening the friction-band, rope, or chain around the ring .or ruffle 3 to be varied according to the results desired to be secured in weaving, the connecting-link 9 is combined with the levers 8 and 10 in manner providing for adjustment of the leverage. The lower end of the said link is oined pivotally to the free end of lever 10 by means of a pivot 9, its upper end being joined to lever 8 by means of a pivot 9 that is adjustable along a slot 8 in lever 8 into positions at different distances from the fulcrum of lever 8. Slot 8 is curved, its radius corresponding with the length of connecting-link '9 in order that when the parts are in their normal working positions shown in the drawings adjustment of pivot 9 along slot 8 may not raise or lower the lever 8 and warp-beam. By adjustment of the nuts 7, 7, upon the threaded stem of the hook 5 the levers and warp-beam may be raised or lowered to place the warpbeam at the required height. By means of the chain the warp-beam is supported with its journal or gudgeon raised above the bottom of the usual recessed bearing therefor which is provided in the loom-side as usual. to contain such journal or gudgeon. When the chain is slackened, this permits the j-ournal or gudgeon to descend and rest upon the bottom of the usual bearing, by which it will then be supported.

The hook 11 may be formed integral with lever 10, but preferably it is formed separate and with a plate 11 for application against one side of the lever 10, and is atlixed to the lever by means of a bolt 11". The plate has a lip or flange 11 engaging against the under edge of the lever 10 to prevent the hook from swinging around the bolt, and the hook is made adjustable lengthwise of lever 10 by means of a slot 10 extending lengthwise of said lever and receiving the stem of the bolt.

The devices shown combined with the Wfll.P -li)6:tfll will usually be duplicated at the opposite ends of the warp-beam.

What is claimed as the invention is The combination with a warp-beam, and friction-devices therefor, of an operating lever for the said friction-devices, a warp-beam supporting lever having a slot 8", and a link connecting said levers, pivoted to the ope 'ating lever and adjustable along said slot in a path concentric with its point of pivotal connection with the operating lever to vary the effect of the weight of the warp-beam and its contents transmitted Goptes of this: patent may be obtained for from the warp-beam supporting lever to the operating lever.

2. A let-off for looms comprising, in con1- bin-ation with a warp-beam, an operating lever, a warp-beam supporting lever, means for supporting the latter lever from the operating lever and varying the effective leverage through which the weight of the warpbeam actuates the operating lever, a flexible friction device engaged with a suitable external point of resistance, then applying friction to retard the rotation of the warpbeam, and then engaged with the operating lever, and means of adjustment of the flexible friction-device whereby to adjust the two levers to raise or lower the warp-beam bodily.

In testimony whereof I aifi-X my signature in presence of two witnesses.

SIMEON S. JACKSON.

Witnesses CHAS. F. RANDALL, E. A. BARrzscH.

five cents each, by addressing the, Gcmmissioner of Batents,

Washington, D. C. r 

